Telit Wireless Solutions ME910G1, Руководство по конструкции

Страница: 42 / 93

ME910G1 Hardware Design Guide
1VV0301593 Rev.12
Page 42 of 93 2021-09-24
Not Subject to NDA
In the following flow chart the proper restart procedure is detailed:
Figure 11: restart procedure flow chart
Note: Do not use any pull up resistor on the HW_SHUTDOWN* line
nor any totem pole digital output. Using pull up resistor may bring to
latch up problems on the ME910G1 power regulator and improper
functioning of the module.
To proper power on again the module please refer to the related
paragraph (“Power ON”)
The unconditional hardware shutdown must always be implemented
on the boards and should be used only as an emergency exit
procedure.
Note: In order to avoid a back powering it is recommended to prevent
any HIGH logic level signal from being applied to the digital pins of
the ME910G1 when the module is powered off or during an ON-OFF
transition.
“ HW SHUTDOWN
Unconditional ”
START
HW_SHUTDOWN* = LOW
Delay = 200ms
PWRMON = ON
Disconnect
VBATT
Y
N
“ HW SHUTDOWN
Unconditional ”
END
HW_SHUTDOWN* = HIGH
Delay = 1s